120 ADAPTATION AND PROGRESS 
physical adaptation are clearly set forth with suggestions of the 
potency of artificial selection and hygiene, — factors that belong 
to active adaptation. 
This work we have so briefly reviewed takes us into the very 
heart of inductive sociology and might well introduce us at once 
to a review of the social philosophers who have emphasized the 
inductive method as applied to the whole social process but we 
must turn aside to consider some who have given their attention 
primarily to the problem of social philosophy as a whole, to the de- 
velopment of the concept of society as a psychological organism, 
and to an analysis of the socio-psychical factors in the develop- 
ment of civilization, — all these writers making considerable use 
of the deductive method. 
